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GitHub 更換 github.com 的 SSH host key (RSA 部份)

 1 year ago
source link: https://blog.gslin.org/archives/2023/03/24/11112/github-%e6%9b%b4%e6%8f%9b-github-com-%e7%9a%84-ssh-host-key-rsa-%e9%83%a8%e4%bb%bd/
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GitHub 更換 github.com 的 SSH host key (RSA 部份)

看到 GitHub 宣佈更換 SSH key (RSA 的部份):「We updated our RSA SSH host key」。

Hacker News 上的「We updated our RSA SSH host key (github.blog)」這邊有人提到官方文件 (原文裡面也有提到),裡面會列出對應的 key:「GitHub's SSH key fingerprints」。

只是看起來這些大公司依然對 DNSSEC + SSHFP 這樣的組合沒興趣...

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OpenSSH 8.4 預設停用 ssh-rsa

前幾天 OpenSSH 8.4 釋出了:「Announce: OpenSSH 8.4 released」。 比較重要的改變是 ssh-rsa 預設變成停用,因為是使用 SHA-1 演算法的關係: It is now possible[1] to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K. For this reason, we will be disabling the "ssh-rsa" public key signature algorithm by default in a near-future release. 官方給了三個方案: The RFC8332…

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GitHub 要求全面檢查 SSH Key

在 GitHub 被攻擊成功後 (參考 GitHub 官方所說的「Public Key Security Vulnerability and Mitigation」這篇),官方除了把漏洞修補完以外,接下來做了更積極的措施:暫停所有的 SSH key 存取權限,一律等到用戶 audit 確認過後才開放:「SSH Key Audit」。 這次 GitHub 除了修正問題、audit key 以外,另外還提出了新的機制讓用戶更容易發現異常存取行為,包括了: 新增 SSH public key 時要輸入密碼。 新增 SSH public key 成功後會寄信通知。 新增「Security History」頁面可以看到帳戶的安全狀況。 算是很積極補救的作法。 另外說明,要如何 audit key,也就是要如何取得你的 public key fingerprint: ssh-keygen -lf .ssh/id_rsa.pub (如果你是用 RSA) 或是 ssh-keygen -lf…

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對 GitHub 的 Public Key 分析

在 Hacker News Daily 上看到有人針對 GitHub 上的 Public Key 分析:「Auditing GitHub users’ SSH key quality」。 這個分析主要用的是 GitHub 的 .keys 功能取得: A little known feature of GitHub is the ability to look at the public SSH keys that other users have set to be authorised on their account (for example https://github.com/torvalds.keys)…

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a611ee8db44c8d03a20edf0bf5a71d80?s=49&d=identicon&r=gAuthor Gea-Suan LinPosted on March 24, 2023March 24, 2023Categories Computer, Murmuring, Network, Security, ServiceTags github, github.com, host, key, rsa, security, ssh

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